For bottle bombs, what matters is how much you use and residual sugar, not the ABV of the ale. You have excellent attenuation (what yeast? Pacman?), so there is little concern over residual sugars. I suspect what people are aiming for by priming with some of the original wort is greater consistency of flavor.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk